Farmer has allowed two earned runs and six hits over 8 1/3 innings in five Major League appearances this year. He also has 10 strikeouts and three walks. He last pitched on May 3 in Cleveland, throwing two shutout innings.
Collins returns to the Tigers after being sent down less than two weeks ago. He's hitting .100 in the Majors this season (2-for-20) with a .100 on-base percentage, and he was in some hot water after an obscene gesture to the Detroit crowd after losing a ball in the lights on April 25.
He provides a left-handed bat and outfield defense for a Tigers team that had only three true outfielders on the roster before this move.
Chris Vannini is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.